American Century Growth Funds N-CSR26 Sep 24Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Jul. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	AMERICAN CENTURY GROWTH FUNDS, INC.
Entity Central Index Key	0001353176
Entity Investment Company Type	N-1A
Document Period End Date	Jul. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended	64 Months Ended	92 Months Ended
Shareholder Report	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding	Jul. 31, 2024 USD ($) holding
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	AMERICAN CENTURY GROWTH FUNDS, INC.
Entity Central Index Key	0001353176
Entity Investment Company Type	N-1A
Document Period End Date	Jul. 31, 2024
C000033214 [Member]
Shareholder Report [Line Items]
Fund Name	Focused Dynamic Growth Fund
Class Name	Investor Class
Trading Symbol	ACFOX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Focused Dynamic Growth Fund for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $97 0.86%
Expenses Paid, Amount	$ 97
Expense Ratio, Percent	0.86%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? Focused Dynamic Growth Fund Investor Class returned 25.97% for the reporting period ended July 31, 2024. The fund seeks long-term capital growth. The commentary below refers to the fund's performance compared to the Russell 1000 Growth Index. • The surge of investor interest in companies tied to the build-out of artificial intelligence infrastructure was a significant driver of U.S. stock market performance during the period. In this environment, the fund’s positions in the information technology sector contributed the most to results. Key holdings included semiconductor stocks NVIDIA and Monolithic Power Systems. • Health care was an area of strength. Innovation and new drug and device approvals are running near all-time highs. This includes breakthrough treatments for diabetes, obesity and Alzheimer’s disease approved in recent years. Regeneron Pharmaceuticals was a leading contributor and a good example of these trends, reporting positive clinical trial data and FDA approvals. • Stock selection detracted from performance in the industrials sector. Paylocity Holding, a payroll and human resources software provider, was the leading detractor after issuing disappointing results and guidance in late 2023. Finance and human resource-related software stocks generally faced a difficult environment as high interest rates and economic uncertainty weighed on corporate spending. • In the financials sector, positioning among financial services firms hurt. We prefer companies benefiting from the secular trend toward the electronification/digitization of payments. However, Block (formerly Square), Adyen and Mastercard underperformed amid worries about a global economic slowdown, higher interest rates and the financial health of the consumers.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year Investor Class 25.97% 15.62% 14.74% Regulatory Index Russell 1000 21.50% 14.59% 12.86% Performance Index Russell 1000 Growth 26.94% 18.41% 16.31%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,722,711,507	$ 1,722,711,507	$ 1,722,711,507
Holdings Count \| holding	42	42	42
Advisory Fees Paid, Amount	$ 8,964,788
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Top Five Industries (as a % of net assets) Common Stocks 99.7% Semiconductors and Semiconductor Equipment 19% Short-Term Investments 0.6% Software 13% Other Assets and Liabilities (0.3)% Interactive Media and Services 12% Broadline Retail 11% Biotechnology 10%
C000033215 [Member]
Shareholder Report [Line Items]
Fund Name	Focused Dynamic Growth Fund
Class Name	I Class
Trading Symbol	ACFSX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Focused Dynamic Growth Fund for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment I Class $75 0.66%
Expenses Paid, Amount	$ 75
Expense Ratio, Percent	0.66%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? Focused Dynamic Growth Fund I Class returned 26.22% for the reporting period ended July 31, 2024. The fund seeks long-term capital growth. The commentary below refers to the fund's performance compared to the Russell 1000 Growth Index. • The surge of investor interest in companies tied to the build-out of artificial intelligence infrastructure was a significant driver of U.S. stock market performance during the period. In this environment, the fund’s positions in the information technology sector contributed the most to results. Key holdings included semiconductor stocks NVIDIA and Monolithic Power Systems. • Health care was an area of strength. Innovation and new drug and device approvals are running near all-time highs. This includes breakthrough treatments for diabetes, obesity and Alzheimer’s disease approved in recent years. Regeneron Pharmaceuticals was a leading contributor and a good example of these trends, reporting positive clinical trial data and FDA approvals. • Stock selection detracted from performance in the industrials sector. Paylocity Holding, a payroll and human resources software provider, was the leading detractor after issuing disappointing results and guidance in late 2023. Finance and human resource-related software stocks generally faced a difficult environment as high interest rates and economic uncertainty weighed on corporate spending. • In the financials sector, positioning among financial services firms hurt. We prefer companies benefiting from the secular trend toward the electronification/digitization of payments. However, Block (formerly Square), Adyen and Mastercard underperformed amid worries about a global economic slowdown, higher interest rates and the financial health of the consumers.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year I Class 26.22% 15.85% 14.97% Regulatory Index Russell 1000 21.50% 14.59% 12.86% Performance Index Russell 1000 Growth 26.94% 18.41% 16.31%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,722,711,507	$ 1,722,711,507	$ 1,722,711,507
Holdings Count \| holding	42	42	42
Advisory Fees Paid, Amount	$ 8,964,788
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Top Five Industries (as a % of net assets) Common Stocks 99.7% Semiconductors and Semiconductor Equipment 19% Short-Term Investments 0.6% Software 13% Other Assets and Liabilities (0.3)% Interactive Media and Services 12% Broadline Retail 11% Biotechnology 10%
C000033216 [Member]
Shareholder Report [Line Items]
Fund Name	Focused Dynamic Growth Fund
Class Name	A Class
Trading Symbol	ACFDX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Focused Dynamic Growth Fund for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment A Class $125 1.11%
Expenses Paid, Amount	$ 125
Expense Ratio, Percent	1.11%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? Focused Dynamic Growth Fund A Class returned 25.63% for the reporting period ended July 31, 2024. The fund seeks long-term capital growth. The commentary below refers to the fund's performance compared to the Russell 1000 Growth Index. • The surge of investor interest in companies tied to the build-out of artificial intelligence infrastructure was a significant driver of U.S. stock market performance during the period. In this environment, the fund’s positions in the information technology sector contributed the most to results. Key holdings included semiconductor stocks NVIDIA and Monolithic Power Systems. • Health care was an area of strength. Innovation and new drug and device approvals are running near all-time highs. This includes breakthrough treatments for diabetes, obesity and Alzheimer’s disease approved in recent years. Regeneron Pharmaceuticals was a leading contributor and a good example of these trends, reporting positive clinical trial data and FDA approvals. • Stock selection detracted from performance in the industrials sector. Paylocity Holding, a payroll and human resources software provider, was the leading detractor after issuing disappointing results and guidance in late 2023. Finance and human resource-related software stocks generally faced a difficult environment as high interest rates and economic uncertainty weighed on corporate spending. • In the financials sector, positioning among financial services firms hurt. We prefer companies benefiting from the secular trend toward the electronification/digitization of payments. However, Block (formerly Square), Adyen and Mastercard underperformed amid worries about a global economic slowdown, higher interest rates and the financial health of the consumers.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024 The initial investment is adjusted to reflect the maximum initial sales charge.
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year A Class 25.63% 15.33% 14.46% A Class - with sales charge 18.41% 13.97% 13.79% Regulatory Index Russell 1000 21.50% 14.59% 12.86% Performance Index Russell 1000 Growth 26.94% 18.41% 16.31%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,722,711,507	$ 1,722,711,507	$ 1,722,711,507
Holdings Count \| holding	42	42	42
Advisory Fees Paid, Amount	$ 8,964,788
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Top Five Industries (as a % of net assets) Common Stocks 99.7% Semiconductors and Semiconductor Equipment 19% Short-Term Investments 0.6% Software 13% Other Assets and Liabilities (0.3)% Interactive Media and Services 12% Broadline Retail 11% Biotechnology 10%
C000033217 [Member]
Shareholder Report [Line Items]
Fund Name	Focused Dynamic Growth Fund
Class Name	R Class
Trading Symbol	ACFCX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Focused Dynamic Growth Fund for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R Class $153 1.36%
Expenses Paid, Amount	$ 153
Expense Ratio, Percent	1.36%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? Focused Dynamic Growth Fund R Class returned 25.34% for the reporting period ended July 31, 2024. The fund seeks long-term capital growth. The commentary below refers to the fund's performance compared to the Russell 1000 Growth Index. • The surge of investor interest in companies tied to the build-out of artificial intelligence infrastructure was a significant driver of U.S. stock market performance during the period. In this environment, the fund’s positions in the information technology sector contributed the most to results. Key holdings included semiconductor stocks NVIDIA and Monolithic Power Systems. • Health care was an area of strength. Innovation and new drug and device approvals are running near all-time highs. This includes breakthrough treatments for diabetes, obesity and Alzheimer’s disease approved in recent years. Regeneron Pharmaceuticals was a leading contributor and a good example of these trends, reporting positive clinical trial data and FDA approvals. • Stock selection detracted from performance in the industrials sector. Paylocity Holding, a payroll and human resources software provider, was the leading detractor after issuing disappointing results and guidance in late 2023. Finance and human resource-related software stocks generally faced a difficult environment as high interest rates and economic uncertainty weighed on corporate spending. • In the financials sector, positioning among financial services firms hurt. We prefer companies benefiting from the secular trend toward the electronification/digitization of payments. However, Block (formerly Square), Adyen and Mastercard underperformed amid worries about a global economic slowdown, higher interest rates and the financial health of the consumers.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) July 31, 2014, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year 10 Year R Class 25.34% 15.05% 14.17% Regulatory Index Russell 1000 21.50% 14.59% 12.86% Performance Index Russell 1000 Growth 26.94% 18.41% 16.31%
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,722,711,507	$ 1,722,711,507	$ 1,722,711,507
Holdings Count \| holding	42	42	42
Advisory Fees Paid, Amount	$ 8,964,788
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Top Five Industries (as a % of net assets) Common Stocks 99.7% Semiconductors and Semiconductor Equipment 19% Short-Term Investments 0.6% Software 13% Other Assets and Liabilities (0.3)% Interactive Media and Services 12% Broadline Retail 11% Biotechnology 10%
C000174988 [Member]
Shareholder Report [Line Items]
Fund Name	Focused Dynamic Growth Fund
Class Name	R6 Class
Trading Symbol	ACFNX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Focused Dynamic Growth Fund for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment R6 Class $58 0.51%
Expenses Paid, Amount	$ 58
Expense Ratio, Percent	0.51%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? Focused Dynamic Growth Fund R6 Class returned 26.40% for the reporting period ended July 31, 2024. The fund seeks long-term capital growth. The commentary below refers to the fund's performance compared to the Russell 1000 Growth Index. • The surge of investor interest in companies tied to the build-out of artificial intelligence infrastructure was a significant driver of U.S. stock market performance during the period. In this environment, the fund’s positions in the information technology sector contributed the most to results. Key holdings included semiconductor stocks NVIDIA and Monolithic Power Systems. • Health care was an area of strength. Innovation and new drug and device approvals are running near all-time highs. This includes breakthrough treatments for diabetes, obesity and Alzheimer’s disease approved in recent years. Regeneron Pharmaceuticals was a leading contributor and a good example of these trends, reporting positive clinical trial data and FDA approvals. • Stock selection detracted from performance in the industrials sector. Paylocity Holding, a payroll and human resources software provider, was the leading detractor after issuing disappointing results and guidance in late 2023. Finance and human resource-related software stocks generally faced a difficult environment as high interest rates and economic uncertainty weighed on corporate spending. • In the financials sector, positioning among financial services firms hurt. We prefer companies benefiting from the secular trend toward the electronification/digitization of payments. However, Block (formerly Square), Adyen and Mastercard underperformed amid worries about a global economic slowdown, higher interest rates and the financial health of the consumers.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) December 1, 2016, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date R6 Class 26.40% 16.03% 19.21% 12/1/16 Regulatory Index Russell 1000 21.50% 14.59% 14.50% — Performance Index Russell 1000 Growth 26.94% 18.41% 18.97% —
Performance Inception Date			Dec. 01, 2016
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,722,711,507	$ 1,722,711,507	$ 1,722,711,507
Holdings Count \| holding	42	42	42
Advisory Fees Paid, Amount	$ 8,964,788
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Top Five Industries (as a % of net assets) Common Stocks 99.7% Semiconductors and Semiconductor Equipment 19% Short-Term Investments 0.6% Software 13% Other Assets and Liabilities (0.3)% Interactive Media and Services 12% Broadline Retail 11% Biotechnology 10%
C000212516 [Member]
Shareholder Report [Line Items]
Fund Name	Focused Dynamic Growth Fund
Class Name	G Class
Trading Symbol	ACFGX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about Focused Dynamic Growth Fund for the period of August 1, 2023 to July 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number	1-800-345-2021
Additional Information Website	americancentury.com/docs
Expenses [Text Block]	What were the fund costs for the last year? (based on a hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment G Class $1 0.01%
Expenses Paid, Amount	$ 1
Expense Ratio, Percent	0.01%
Factors Affecting Performance [Text Block]	What were the key factors that affected the fund’s performance? Focused Dynamic Growth Fund G Class returned 27.04% for the reporting period ended July 31, 2024. The fund seeks long-term capital growth. The commentary below refers to the fund's performance compared to the Russell 1000 Growth Index. • The surge of investor interest in companies tied to the build-out of artificial intelligence infrastructure was a significant driver of U.S. stock market performance during the period. In this environment, the fund’s positions in the information technology sector contributed the most to results. Key holdings included semiconductor stocks NVIDIA and Monolithic Power Systems. • Health care was an area of strength. Innovation and new drug and device approvals are running near all-time highs. This includes breakthrough treatments for diabetes, obesity and Alzheimer’s disease approved in recent years. Regeneron Pharmaceuticals was a leading contributor and a good example of these trends, reporting positive clinical trial data and FDA approvals. • Stock selection detracted from performance in the industrials sector. Paylocity Holding, a payroll and human resources software provider, was the leading detractor after issuing disappointing results and guidance in late 2023. Finance and human resource-related software stocks generally faced a difficult environment as high interest rates and economic uncertainty weighed on corporate spending. • In the financials sector, positioning among financial services firms hurt. We prefer companies benefiting from the secular trend toward the electronification/digitization of payments. However, Block (formerly Square), Adyen and Mastercard underperformed amid worries about a global economic slowdown, higher interest rates and the financial health of the consumers.
Line Graph [Table Text Block]	Cumulative Performance (based on an initial $10,000 investment) April 1, 2019, through July 31, 2024
Average Annual Return [Table Text Block]	Average Annual Total Returns 1 Year 5 Year Since Inception Inception Date G Class 27.04% 16.61% 16.69% 4/1/19 Regulatory Index Russell 1000 21.50% 14.59% 14.58% — Performance Index Russell 1000 Growth 26.94% 18.41% 18.38% —
Performance Inception Date		Apr. 01, 2019
No Deduction of Taxes [Text Block]	The opinions expressed are those of American Century Investments and are no guarantee of the future performance of any American Century Investments fund. This information is for educational purposes only and is not intended as investment advice. Data reflects past performance, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value will fluctuate and redemption value may be more or less than original cost, and none of the charts reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.
Updated Performance Information Location [Text Block]	Visit americancentury.com for more recent performance information.
Net Assets	$ 1,722,711,507	$ 1,722,711,507	$ 1,722,711,507
Holdings Count \| holding	42	42	42
Advisory Fees Paid, Amount	$ 8,964,788
Investment Company, Portfolio Turnover	8%
Holdings [Text Block]	Fund Holdings Types of Investments in Portfolio (as a % of net assets) Top Five Industries (as a % of net assets) Common Stocks 99.7% Semiconductors and Semiconductor Equipment 19% Short-Term Investments 0.6% Software 13% Other Assets and Liabilities (0.3)% Interactive Media and Services 12% Broadline Retail 11% Biotechnology 10%

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019	Apr. 01, 2019	Jul. 31, 2018	Jul. 31, 2017	Dec. 01, 2016	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
C000033214 [Member]
Account Value [Line Items]
Account Value	$ 39,564	$ 31,408	$ 27,734	$ 38,745	$ 28,471	$ 19,145		$ 17,133	$ 12,987		$ 10,866	$ 10,755	$ 10,000
C000033215 [Member]
Account Value [Line Items]
Account Value	40,356	31,972	28,177	39,276	28,804	19,335		17,267	13,067		10,907	10,774	10,000
C000033216 [Member]
Account Value [Line Items]
Account Value	36,380	28,957	25,632	35,890	26,437	17,828		15,988	12,155		10,195	10,110	9,425
C000033217 [Member]
Account Value [Line Items]
Account Value	37,641	30,032	26,650	37,414	27,629	18,674		16,793	12,800		10,762	10,704	10,000
C000174988 [Member]
Account Value [Line Items]
Account Value	38,478	30,442	26,784	37,287	27,307	18,297		16,316	12,325	$ 10,000
C000212516 [Member]
Account Value [Line Items]
Account Value	22,788	17,937	15,703	21,750	15,850	10,568	$ 10,000
Russell 1000 [Member]
Account Value [Line Items]
Account Value	33,519	27,587	24,424	26,226	19,009	16,967		15,710	13,521		11,661	11,124	10,000
Russell 1000 (Inception Date 12/1/16) [Member]
Account Value [Line Items]
Account Value	28,249	23,250	20,585	22,103	16,021	14,300		13,240	11,396	10,000
Russell 1000 (Inception Date 4/1/19) [Member]
Account Value [Line Items]
Account Value	20,671	17,013	15,063	16,174	11,723	10,464	10,000
Russell 1000 Growth [Member]
Account Value [Line Items]
Account Value	45,306	35,692	30,426	34,546	25,275	19,467		17,566	14,299		$ 12,113	$ 11,608	$ 10,000
Russell 1000 Growth (Inception Date 12/1/16) [Member]
Account Value [Line Items]
Account Value	37,886	29,846	25,443	28,888	21,136	16,279		$ 14,689	$ 11,957	$ 10,000
Russell 1000 Growth (Inception Date 4/1/19) [Member]
Account Value [Line Items]
Account Value	$ 24,613	$ 19,390	$ 16,529	$ 18,768	$ 13,731	$ 10,576	$ 10,000

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	12 Months Ended	60 Months Ended	64 Months Ended	92 Months Ended	120 Months Ended
Shareholder Report, Average Annual Return (Details)	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2024
C000033214 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	25.97%	15.62%			14.74%
C000033215 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	26.22%	15.85%			14.97%
C000033216 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	18.41%	13.97%			13.79%
C000033217 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	25.34%	15.05%			14.17%
C000174988 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	26.40%	16.03%		19.21%
C000212516 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	27.04%	16.61%	16.69%
Without Sales Load [Member] \| C000033216 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	25.63%	15.33%			14.46%
Russell 1000 [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.50%	14.59%			12.86%
Russell 1000 (Inception Date 12/1/16) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.50%	14.59%		14.50%
Russell 1000 (Inception Date 4/1/19) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	21.50%	14.59%	14.58%
Russell 1000 Growth [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	26.94%	18.41%			16.31%
Russell 1000 Growth (Inception Date 12/1/16) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	26.94%	18.41%		18.97%
Russell 1000 Growth (Inception Date 4/1/19) [Member]
Average Annual Return [Line Items]
Average Annual Return, Percent	26.94%	18.41%	18.38%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Jul. 31, 2024
C000033214 [Member] \| Semiconductors and Semiconductor Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	19%
C000033214 [Member] \| Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
C000033214 [Member] \| Interactive Media and Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000033214 [Member] \| Broadline Retail [Member]
Holdings [Line Items]
Percent of Net Asset Value	11%
C000033214 [Member] \| Biotechnology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
C000033214 [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.70%
C000033214 [Member] \| Short-Term Investment [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000033214 [Member] \| Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.30%)
C000033215 [Member] \| Semiconductors and Semiconductor Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	19%
C000033215 [Member] \| Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
C000033215 [Member] \| Interactive Media and Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000033215 [Member] \| Broadline Retail [Member]
Holdings [Line Items]
Percent of Net Asset Value	11%
C000033215 [Member] \| Biotechnology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
C000033215 [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.70%
C000033215 [Member] \| Short-Term Investment [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000033215 [Member] \| Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.30%)
C000033216 [Member] \| Semiconductors and Semiconductor Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	19%
C000033216 [Member] \| Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
C000033216 [Member] \| Interactive Media and Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000033216 [Member] \| Broadline Retail [Member]
Holdings [Line Items]
Percent of Net Asset Value	11%
C000033216 [Member] \| Biotechnology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
C000033216 [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.70%
C000033216 [Member] \| Short-Term Investment [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000033216 [Member] \| Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.30%)
C000033217 [Member] \| Semiconductors and Semiconductor Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	19%
C000033217 [Member] \| Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
C000033217 [Member] \| Interactive Media and Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000033217 [Member] \| Broadline Retail [Member]
Holdings [Line Items]
Percent of Net Asset Value	11%
C000033217 [Member] \| Biotechnology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
C000033217 [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.70%
C000033217 [Member] \| Short-Term Investment [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000033217 [Member] \| Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.30%)
C000174988 [Member] \| Semiconductors and Semiconductor Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	19%
C000174988 [Member] \| Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
C000174988 [Member] \| Interactive Media and Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000174988 [Member] \| Broadline Retail [Member]
Holdings [Line Items]
Percent of Net Asset Value	11%
C000174988 [Member] \| Biotechnology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
C000174988 [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.70%
C000174988 [Member] \| Short-Term Investment [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000174988 [Member] \| Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.30%)
C000212516 [Member] \| Semiconductors and Semiconductor Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	19%
C000212516 [Member] \| Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	13%
C000212516 [Member] \| Interactive Media and Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	12%
C000212516 [Member] \| Broadline Retail [Member]
Holdings [Line Items]
Percent of Net Asset Value	11%
C000212516 [Member] \| Biotechnology [Member]
Holdings [Line Items]
Percent of Net Asset Value	10%
C000212516 [Member] \| Common Stock [Member]
Holdings [Line Items]
Percent of Net Asset Value	99.70%
C000212516 [Member] \| Short-Term Investment [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000212516 [Member] \| Other Assets and Liabilities [Member]
Holdings [Line Items]
Percent of Net Asset Value	(0.30%)